28199397 has 8 divisors (see below), whose sum is σ = 38895840. Its totient is φ = 18151280.

The previous prime is 28199393. The next prime is 28199407. The reversal of 28199397 is 79399182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28199397 - 2² = 28199393 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28199393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161979 + ... + 162152.

It is an arithmetic number, because the mean of its divisors is an integer number (4861980).

Almost surely, 2^28199397 is an apocalyptic number.

It is an amenable number.

28199397 is a deficient number, since it is larger than the sum of its proper divisors (10696443).

28199397 is a wasteful number, since it uses less digits than its factorization.

28199397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324163.

The product of its digits is 244944, while the sum is 48.

The square root of 28199397 is about 5310.3104429026. The cubic root of 28199397 is about 304.3780104044.

The spelling of 28199397 in words is "twenty-eight million, one hundred ninety-nine thousand, three hundred ninety-seven".